How Do Oysters Make Pearls?

Quick Questions gives you the low-down on how oysters turn a tiny bit of gunk into a lovely, valuable pearl.
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Sources:
http://www.livescience.com/32289-how-do-oysters-make-pearls.html

http://www.humantouchofchemistry.com/how-do-oysters-make-pearls.htm

http://www.scientificamerican.com/podcast/episode/as-the-pearl-turns-13-06-27/

http://www.popsci.com/science/article/2013-06/why-are-pearls-round

http://www.geo.utexas.edu/courses/347k/redesign/gem_notes/pearl/pearl_main.htm

http://nature.berkeley.edu/classes/eps2/wisc/Lect17.html
http://ressearch.files.wordpress.com/2014/03/abalone-nacre-1.jpg

Видео How Do Oysters Make Pearls? канала SciShow